set hull from vertex format

The user can create a convex hull from a vertex format, not directly from a list of vertices. That's interesting because in some 3D engines convex hulls are typically created from a render mesh that might structure a vertex in different ways in the memory.

examples/testbed/tests/convex_hull.h

@@ -81,7 +81,7 @@ public:
 			m_points[m_count++] = p;
 		}
 		
-		m_hull.Set(m_points, m_count);
+		m_hull.Set(sizeof(b3Vec3), m_points, m_count);
 		assert(m_hull.faceCount > 0);
 		m_selection = m_hull.GetSupportFace(b3Vec3_z);
 	}

examples/testbed/tests/hull_collision.h

@@ -85,14 +85,14 @@ public:
 	void Step()
 	{
 		b3QHull hull1;
-		hull1.Set(m_points1, e_count);
+		hull1.Set(sizeof(b3Vec3), m_points1, e_count);
 
 		b3HullShape sA;
 		sA.m_hull = &hull1;
 		m_shapeA = &sA;
 
 		b3QHull hull2;
-		hull2.Set(m_points2, e_count);
+		hull2.Set(sizeof(b3Vec3), m_points2, e_count);
 
 		b3HullShape sB;
 		sB.m_hull = &hull2;

examples/testbed/tests/hull_contact_test.h

@@ -66,7 +66,7 @@ public:
 				points[j] = p;
 			}
 
-			hull->Set(points, count);
+			hull->Set(sizeof(b3Vec3), points, count);
 		}
 
 		{